Water/gear oil leaking from pinion seal

I knew I had a slight leak at the pinion seal of my front D44 that I swapped for the 10b in February. I bought the axle from another member. The axle sat outside before the install, and was subjected to the heavy rains in Jan/Feb earlier this year. I haven't engage 4WD yet. I'm obviously going to open up the diff cover and drain the gear oil. Is there anything I should be looking for? Could there be water in there from the rain or was is it more likely that it was subjected to some abuse before I bought it?

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